Pfizer Vaccine For 12 To 15-Year-Olds Approved By UK Regulator Pfizer Vaccine For 12 To 15-Year-Olds Approved By UK Regulator The British regulator's approval follows that of the European Medicines Agency and US Food and Drug Administration last month for the younger cohort to receive the Pfizer/BioNTech jab. The regulator approved the two-shot jab following clinical trials among younger age groups London: Britain's medicines regulator said Friday the Pfizer/BioNTech vaccine is safe for adolescents aged 12 to 15 after a "rigorous review", following similar assessments in the European Union and United States. The Medicines and Healthcare products Regulatory Agency (MHRA) approved the two-shot jab following clinical trials among younger age groups, saying the vaccine had met the "expected standards" of safety, quality and effectiveness.